Direct spectroscopic investigations of metal oxide solubility and metal transport in supercritical water

提出的研究目标是通过实验推导出一套一致的过渡金属溶质热力学性质，可用于预测超临界水反应堆中腐蚀产物的传输和沉积。为此，将利用原位x射线吸收光谱（XAS）获得超临界水中过渡金属的稳定性和结构的新数据。XAS数据将与高温下选定金属氧化物-水体系的直接x射线荧光（XRF）光谱测量所获得的溶解度测量相结合。本研究旨在对高温水系统在分子尺度上的物理和化学机制有一个基本的认识。该项目的预期结果需要指定适当的化学控制策略或开发其他方法来减轻第四代超临界水反应堆中腐蚀产物传输的影响。

The objective of the proposed research is to experimentally derive a consistent set of thermodynamic properties for transition metal solutes which can be used to predict corrosion product transport and deposition in supercritical water reactors. To this end, in situ x-ray absorption spectroscopy (XAS) will be used to obtain new data on the stability and structure transition metal species in supercritical water. The XAS data will be combined with solubility measurements obtained by direct x-ray fluorescence (XRF) spectroscopic measurements of selected metal oxide-water systems at elevated temperatures. This research seeks to gain a fundamental understanding of the physical and chemical mechanisms at the molecular scale in high temperature water systems. The anticipated results of the project are needed to specify appropriate chemistry control strategies or to develop other methods to mitigate the effects of corrosion product transport in GEN IV supercritical water reactors.